2023-02-14
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#rust
Matteo Di Pirro
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Feb 14, 2023 ⋅ 3 min read

How to define higher-order functions in Rust

Matteo Di Pirro I am an enthusiastic young software engineer who specialized in the theory of programming languages and type safety. I enjoy learning and experimenting with new technologies and languages, looking for effective ways to employ them.

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2 Replies to "How to define higher-order functions in Rust"

    1. Hello Giles. A method in Rust is just a function, which also takes a first `self` parameter (similarly to Python). Hence, passing a method is just a matter of using the right types in the function signatures:

      pub struct Greeter {
      greeting: String
      }

      impl Greeter {
      fn greet(&self, name: String) -> String {
      return format!(“{}, {}”, self.greeting, name);
      }
      }

      fn call(name: String, fun: fn(&Greeter, String) -> String) -> String {
      let greeter = Greeter { greeting: “Hello”.to_string() };
      return fun(&greeter, name);
      }

      fn main() {
      println!(“{}”, call(“Giles”.to_string(), Greeter::greet));
      }

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